Tenter-clip.



M. P. HAYWARD.

TENTER CLIP.

APPLICATION FILED km, 1914.

1,1 1 9,824. Patented Dec. 8, 1914.

mmesses lizventor Q/QW 1 222 movable jaw forward so as MELVILLE P. HAYWARD, 0F QUINCY, MASSACHUSETTS.

TENTER-CLIP.

Specification of Letters Patent.

Application filed January 7, 1914. Serial No. 810,874.

others skilled in theart to which it apper tains to make and use the same.

The present invention relates to an im-,

provement in tenter clips for cloth stretching machines.

The object of the invention is to produce i a clip having means tending to cause the swing aw to engage force the harder the cloth is pulled the cloth with increas- .ing upon, or to engage the cloth with increasing force the farther the swing jaw is swung in clamping direction.

To the above end the present invention consists in the tenter clip hereinaftervdescribed and particularly defined in the claims.

In the accompanying drawings illustrating the preferred form of the invention, Figure 1 is a side elevation of the clip; Fig. 2 is a plan; and Fig. 3 is a sectional elevation.

The tion is described illustrated embodiment ofthe invenas follows :-The link 1 of the tenter chain is of the usual form and carries a lower or stationary jaw 2. The overhanging arm 3 rises from the link 1 and extends upward and forward and supports upon the pintle 4: the swing or movable clamping jaw 5. The pintle 4 is socured in the bearings at the end of the arm 3 by means of a cotter pin. The controller 6 is pivoted at 7 upon the arm 3 and is provided with a recess 8 which receives the rearwardly projecting arm 9 of the clamping jaw .53 in the usual manner. When the cloth 10 supports the controller 6 it holds the clamping jaw 5 in the position illustrated in Fig. 1. When the cloth moves out from under the controller, the clamping jaw drops upon and engages and holds the cloth, as shown in Fig. 3. When the clamping jaw 5 swings down upon and engages and clamps the cloth against the lower stationary jaw 2, the friction between the cloth and the face of the lower jaw tends to pull the to pinch the cloth between the two jaws. While this friction alone is, in many cases, suflicient to cause the jaws to exert the proper nip upon the cloth sufficient to hold it against the strains to which it is subjected, in some cases the vibration of the chain or the movements to which it is subjected in the stretching operation, ope ate to loosen or to tend to loosen the grip upon the cloth, and in order to secure the firm gripping of the jaws upon the cloth in a manner which increases the clamping effect as the jaw swings forward, the clip is provided with a horseshoe magnet 11 mounted upon the frame, being secured in position t iereon by rivets 12. The poles of the magnet are located somewhat in the rear of the axis of the pintle at and attract the armature 13 mounted upon the upwardly projecting arms 14: of the swing jaw 5. Two filler blocks 15 forming portions of the armature 13 shorten the mag: netic gap between the magnet poles and the armature. The armature 13 is secured to the arms 14 by the rivets 16, and the filler blocks 15 are secured to the armature 13 by the rivets 17. It will be observed that as the swing jaw moves in clamping direction the armature approaches the magnet poles and so the attraction of the armature to the poles is increased as the armature approaches the poles. By reference to Fig. 3, it will be noted that the filler blocks 15 ap proach quite close to the magnet poles, as a result of which the magnetic gap between the poles and the armature is reduced to a very small space.

In cases where springs are employed to move the swing jaw in clamping direction, it is apparent that the force exerted by the spring diminishes as the jaw moves in clamping direction. It is an important fea ture of this invention that the force tending to move the swing jaw in clamping direction increases as the movement progresses, and when the movement has progressed a distance suflicient to cause it to engage the cloth, the attraction of the magnet for the armature is considerable and the swing jaw is thereby held from displacement until it is positively withdrawnin the operation of the machine.

It is believed to be broadly new to mount a magnet on a tenter clip for the purpose of exerting a force upon the swing jaw tending to move it in clamping direction, so the invention contemplates, in its broader-aspects, a tenter clip and any form of mag Patented Dec. 8, 1914.

netic means for exerting a force upon the swing jaw tending to move it in clamping direction. The invention is not limited, therefore, to the illustrated embodiment, but may be embodied within other forms within the scope of the following claims.

I claim 1. A tenter clip having, in combination, cloth-engaging jaws and magnetic means tending to cause the aws to clamp the cloth between them, substantially as described.

2. A tenter clip having, in combination, clamping aws and magnetic means tending to cause them to clamp the cloth between them having provision for exerting an in creasing clamping eflect upon the cloth as the jaws close, substantially as described.

3. A tenter clip having, in combination, a stationary jaw, a movable jaw, and magnetic means tending to move the movable jaw in clamping direction, substantially as described.

l. A tenter clip having, in combination, a stationary jaw, an overhanging arm, a swing jaw pivotally mounted upon the overhanging arm, and magnetic means tending to move the swing jaw in clamping direc tion, substantially as described.

5. A tenter clip having, in combination, a stationary jaw, an overhanging arm, a swing jaw pivotally mounted thereon, a horseshoe magnet mounted on the frame, and an armature mounted on the movable jaw in position to be attracted by the horseshoe magnet, substantially as described. MELVILLE P. HAYWARD.

Witnesses HORACE VAN EVEREN, GEO. E. STEBBINS.

Copies of this patent may be obtained for five cents each, by azidressing the "Commissioner of Patents.

Washington, D. G. 

